A building is 12 stories high and is covered entirely by windows on all four sides. Each floor has 38 windows on it. Once a year, all the windows are washed. The cost for washing the windows is $2.00 for each first-floor window, $2.50 for each second-floor window, $3.00 for each third-floor window, and soon. How much will it cost to wash the windows of this building? What if the building is 30 stories tall? n stories tall? (paraphrased from Driscoll, 1999, p. 70)